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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 PreAnalytiX GmbH [Member] | Dec. 31, 2012 QIAGEN Finance [Member] | Aug. 31, 2004 QIAGEN Finance [Member] | Dec. 31, 2012 QIAGEN Euro Finance [Member] | Dec. 31, 2012 Scandinavian Gene Synthesis AB [Member] | Dec. 31, 2011 Scandinavian Gene Synthesis AB [Member] | Dec. 31, 2012 Pyrobett | Dec. 31, 2010 Pyrobett | May 31, 2006 Convertible Notes 3.25% Due in 2026 [Member] QIAGEN Euro Finance [Member]
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 50.00% | 100.00% |  | 100.00% | 40.00% |  | 19.00% |  |
Convertible debt |  |  |  |  | $ 150.0 |  |  |  |  |  | $ 300.0
Stated interest rates |  |  |  |  | 1.50% |  |  |  |  |  | 3.25%
Investment made in company | 15.5 | 6.8 |  |  |  |  |  |  |  | 4.0 |
Cost-method Investments, Other than Temporary Impairment | 3.4 |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  |  |  |  | 9.7 |  |  |
Advance Payment, Equity Method Investment, Additional Shares Acquisition Option |  |  |  |  |  |  |  | 6.7 |  |  |
Equity Method Investment Acquisition Option Percent |  |  |  |  |  |  | 60.00% |  |  |  |
Business Combination Step Acquisition Equity Interest in Acquiree Payment |  |  |  |  |  |  | $ 8.4 |  |  |  |

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